Fix Illegal Operation error on computer

When the computer operating system or processor receives a command from a program that it does not recognize and cannot process, a command called Illegal Operation will appear. Here are the reasons why Illegal Operation error occurred on the computer.

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Third party programs or TSR

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TSR programs (short for terminate-and-stay-resident, is a software program still in memory until it needs to be used and then perform some functions. A typical example of TSR is a virus scanning software, must be stored in memory to help protect the computer) or a third party running in the background is one of the common reasons for Illegal Operation error. If an Illegal Operation error occurs when running a game or program, close all TSR programs and other open programs that run in the background.

If after removing these programs and no longer receiving Illegal Operation notifications, you should restart the computer. When the machine is turned on, turn off or modify the End Task feature for each program or TSR to determine which program causes the Illegal Operation error.

Error while programming

Verify that the program causes an Illegal Operation error corresponding to the Windows version and check with the developer to see if there are any fixes or updates. No software is perfect, so it's no wonder many fixes and updates are released throughout the life of a program.

Data cannot be read from the source properly

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When running a program or game from a CD, the user will experience an Illegal Operation error, ensuring that the CD is 'clean'.

If you are running a game from a floppy disk or other removable drive, verify the drive has no physical errors by running ScanDisk.

Installing the program or game on the hard drive is faulty or highly fragmented

Make sure the drive is not fragmented or corrupted by running ScanDisk and Defrag on the drive.

1. These quality hard drive defragmentation software

If an error exists on the hard drive, they will cause the program or game to run improperly and may cause Illegal Operation errors.

The file is corrupted

Files that are corrupted or missing may cause Illegal Operation errors. Try uninstalling and then reinstalling the program that causes Illegal Operation to verify that any problem files have been replaced or repaired during the reinstallation process.

Memory manager

If you are running a memory manager, users should temporarily disable or uninstall this program to verify that it does not cause Illegal Operations.

Video drivers are problematic, operating incorrectly or out of date

Problematic, inaccurate or outdated video drivers can cause Illegal Operation errors when moving mouse, highlight or when the video card is forced to perform high requirements. Try reducing the resolution to make sure the current settings do not cause problems.

If after adjusting the video settings and still having the same problem, verify whether the computer is using the latest driver for the video card.

Computer virus

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Because other computer and malware viruses load into memory and modify files incorrectly, they can cause Illegal Operation error messages. Make sure the antivirus software is installed on your computer and this utility must be updated regularly.

New hardware just added

If there are recently installed hardware (for example, memory) on your computer, any used drivers may conflict with other computer hardware. Temporarily remove all new hardware and software associated with it to ensure that it is not the cause of the problem.

Memory has problems, bits are invalid

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Problematic memory may cause Illegal Operation errors. If you recently added memory to your computer, remove the memory to make sure it does not cause problems. If no memory has been added recently and you have tried all of the above recommendations, check the current computer memory.

Problems in Windows

Because Windows controls the operation of memory and all system activities, so if any part of Windows is broken, it can cause Illegal Operation. If you have tried all of these suggestions without results, you should reinstall Windows.

Wish you soon fix success errors!

See more:

1. Instructions to fix Windows error does not boot
2. Error handling cannot install updates and program settings
3. Fix IP address conflict error on Windows computer